<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon" title="c1">x</font>, <font color="Maroon" title="c2">y</font>, <font color="Maroon" title="c3">z</font> be   <a href="qc_lang1.html#NM3" title="QC_LANG1:NM.3">bound_QC-variable</a>;<br/><b>let </b><font color="Maroon" title="c4">p</font>, <font color="Maroon" title="c5">q</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="qc_lang1.html#K8" title="QC_LANG1:func.8">QC-WFF</a> ;<br/><b>let </b><font color="Maroon" title="c6">t</font>, <font color="Maroon" title="c7">s</font> be   <a href="qc_lang1.html#NM3" title="QC_LANG1:NM.3">bound_QC-variable</a>;<br/>













<b>assume </b><a NAME="E1:20"/><i><font color="Green" title="E12">A1</font></i>: 
 <a href="qc_lang2.html#K8" title="QC_LANG2:func.8">All</a> <font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">y</font>,<font color="Maroon" title="c3">z</font>,<font color="Maroon" title="c4">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="qc_lang2.html#K6" title="QC_LANG2:func.6">All</a> <font color="Maroon" title="c6">t</font>,<font color="Maroon" title="c7">s</font>,<font color="Maroon" title="c5">q</font>
 ;<br/>

<b>hence </b><a NAME="E2:20"/>
<font color="Maroon" title="c1">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c6">t</font>
 <b>by </b><i><a class="ref" href="qc_lang2.html#T6" target="_self" title="QC_LANG2:th.6">Th6</a></i>;<br/>

<a NAME="E3:20"/>
 <a href="qc_lang2.html#K6" title="QC_LANG2:func.6">All</a> <font color="Maroon" title="c2">y</font>,<font color="Maroon" title="c3">z</font>,<font color="Maroon" title="c4">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="qc_lang1.html#K14" title="QC_LANG1:func.14">All</a> <font color="Maroon" title="c7">s</font>,<font color="Maroon" title="c5">q</font>
 
<b>by </b><i><a class="txt" href="qc_lang2.html#E1:20"><i><font color="Green" title="E12">A1</font></i></a>, <a class="ref" href="qc_lang2.html#T6" target="_self" title="QC_LANG2:th.6">Th6</a></i>;<br/>
<b>hence </b><a NAME="E4:20"/>
( <font color="Maroon" title="c2">y</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c7">s</font> &amp;  <a href="qc_lang1.html#K14" title="QC_LANG1:func.14">All</a> <font color="Maroon" title="c3">z</font>,<font color="Maroon" title="c4">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c5">q</font> )
 <b>by </b><i><a class="ref" href="qc_lang2.html#T6" target="_self" title="QC_LANG2:th.6">Th6</a></i>;<br/>


</div>
